Implement `has` method.
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rmariuzzo commented
Summary
As a user, I would like to have a has method that implement Illuminate/Translation/Translator#has method.
Description
The method should accept 2 arguments: key and locale. The last one should be optional, when not set, use getLocale(). The method will return a boolean value, true if the given key exists with the provided or default locale, otherwise false will be returned.
Tests
The test/spec/lang_has_spec.js should fully cover all cases of has method.